| Structural highlights
Function
[PIF1_YEAST] DNA-dependent ATPase and 5'-3' DNA helicase required for the maintenance of both mitochondrial and nuclear genome stability. Efficiently unwinds G-quadruplex (G4) DNA structures and forked RNA-DNA hybrids. Appears to move along DNA in single nucleotide or base pair steps, powered by hydrolysis of 1 molecule of ATP. Processes at an unwinding rate of about 75 bp/s. Resolves G4 structures, preventing replication pausing and double-strand breaks (DSBs) at G4 motifs. Involved in the maintenance of telomeric DNA. Inhibits telomere elongation, de novo telomere formation and telomere addition to DSBs via catalytic inhibition of telomerase. Reduces the processivity of telomerase by displacing active telomerase from DNA ends. Releases telomerase by unwinding the short telomerase RNA/telomeric DNA hybrid that is the intermediate in the telomerase reaction. Involved in the maintenance of ribosomal (rDNA). Required for efficient fork arrest at the replication fork barrier within rDNA. Involved in the maintenance of mitochondrial (mtDNA). Required to maintain mtDNA under conditions that introduce dsDNA breaks in mtDNA, either preventing or repairing dsDNA breaks. May inhibit replication progression to allow time for repair. May have a general role in chromosomal replication by affecting Okazaki fragment maturation. May have a role in conjunction with DNA2 helicase/nuclease in 5'-flap extension during Okazaki fragment processing.[HAMAP-Rule:MF_03176][1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23]
Publication Abstract from PubMed
The Saccharomyces cerevisiae Pif1 protein (ScPif1p) is the prototypical member of the Pif1 family of DNA helicases. ScPif1p is involved in the maintenance of mitochondrial, ribosomal and telomeric DNA and suppresses genome instability at G-quadruplex motifs. Here, we report the crystal structures of a truncated ScPif1p (ScPif1p237-780) in complex with different ssDNAs. Our results have revealed that a yeast-specific insertion domain protruding from the 2B domain folds as a bundle bearing an alpha-helix, alpha16. The alpha16 helix regulates the helicase activities of ScPif1p through interactions with the previously identified loop3. Furthermore, a biologically relevant dimeric structure has been identified, which can be further specifically stabilized by G-quadruplex DNA. Basing on structural analyses and mutational studies with DNA binding and unwinding assays, a potential G-quadruplex DNA binding site in ScPif1p monomers is suggested. Our results also show that ScPif1p uses the Q-motif to preferentially hydrolyze ATP, and a G-rich tract is preferentially recognized by more residues, consistent with previous biochemical observations. These findings provide a structural and mechanistic basis for understanding the multifunctional ScPif1p.
Insights into the structural and mechanistic basis of multifunctional S. cerevisiae Pif1p helicase.,Lu KY, Chen WF, Rety S, Liu NN, Wu WQ, Dai YX, Li D, Ma HY, Dou SX, Xi XG Nucleic Acids Res. 2017 Nov 30. pii: 4675318. doi: 10.1093/nar/gkx1217. PMID:29202194[24]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
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- ↑ Cheng X, Dunaway S, Ivessa AS. The role of Pif1p, a DNA helicase in Saccharomyces cerevisiae, in maintaining mitochondrial DNA. Mitochondrion. 2007 May;7(3):211-22. doi: 10.1016/j.mito.2006.11.023. Epub 2006, Dec 9. PMID:17257907 doi:http://dx.doi.org/10.1016/j.mito.2006.11.023
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- ↑ Paeschke K, Capra JA, Zakian VA. DNA replication through G-quadruplex motifs is promoted by the Saccharomyces cerevisiae Pif1 DNA helicase. Cell. 2011 May 27;145(5):678-91. doi: 10.1016/j.cell.2011.04.015. PMID:21620135 doi:http://dx.doi.org/10.1016/j.cell.2011.04.015
- ↑ Ramanagoudr-Bhojappa R, Blair LP, Tackett AJ, Raney KD. Physical and functional interaction between yeast Pif1 helicase and Rim1 single-stranded DNA binding protein. Nucleic Acids Res. 2013 Jan;41(2):1029-46. doi: 10.1093/nar/gks1088. Epub 2012, Nov 21. PMID:23175612 doi:http://dx.doi.org/10.1093/nar/gks1088
- ↑ Galletto R, Tomko EJ. Translocation of Saccharomyces cerevisiae Pif1 helicase monomers on single-stranded DNA. Nucleic Acids Res. 2013 Apr;41(8):4613-27. doi: 10.1093/nar/gkt117. Epub 2013 Feb, 27. PMID:23446274 doi:http://dx.doi.org/10.1093/nar/gkt117
- ↑ Ramanagoudr-Bhojappa R, Chib S, Byrd AK, Aarattuthodiyil S, Pandey M, Patel SS, Raney KD. Yeast Pif1 helicase exhibits a one-base-pair stepping mechanism for unwinding duplex DNA. J Biol Chem. 2013 May 31;288(22):16185-95. doi: 10.1074/jbc.M113.470013. Epub, 2013 Apr 17. PMID:23596008 doi:http://dx.doi.org/10.1074/jbc.M113.470013
- ↑ Paeschke K, Bochman ML, Garcia PD, Cejka P, Friedman KL, Kowalczykowski SC, Zakian VA. Pif1 family helicases suppress genome instability at G-quadruplex motifs. Nature. 2013 May 23;497(7450):458-62. doi: 10.1038/nature12149. Epub 2013 May 8. PMID:23657261 doi:http://dx.doi.org/10.1038/nature12149
- ↑ Foury F, Lahaye A. Cloning and sequencing of the PIF gene involved in repair and recombination of yeast mitochondrial DNA. EMBO J. 1987 May;6(5):1441-9. PMID:3038524
- ↑ Schulz VP, Zakian VA. The saccharomyces PIF1 DNA helicase inhibits telomere elongation and de novo telomere formation. Cell. 1994 Jan 14;76(1):145-55. PMID:8287473
- ↑ Lu KY, Chen WF, Rety S, Liu NN, Wu WQ, Dai YX, Li D, Ma HY, Dou SX, Xi XG. Insights into the structural and mechanistic basis of multifunctional S. cerevisiae Pif1p helicase. Nucleic Acids Res. 2017 Nov 30. pii: 4675318. doi: 10.1093/nar/gkx1217. PMID:29202194 doi:http://dx.doi.org/10.1093/nar/gkx1217
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